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本工作应用光学、电子光学及电子衍射等分析手段,对含氧量高于正常GH_(23)合金3—4倍的的7~#合金的高温塑性及持久性能严重降低的原因及其失效机制作了详细分析。实验表明,在时效过程中该合金中发生胞状沉淀反应是导致合金失效的主要原因。本工作观察,分析了该合金中产生的胞状沉淀的形貌特征,晶体结构及分布形态,以及影响胞状沉淀反应的主要因素。结果认为氧含量高是导致该合金胞状沉淀的诱导因素。
In this work, the causes of high temperature ductility and ductility of 7 # alloy with oxygen content higher than that of normal GH_ (23) alloy by 3-4 times were seriously analyzed by means of optical, electronic optics and electron diffraction. Made a detailed analysis. Experiments show that in the aging process occurs in the alloy cell precipitation reaction is the main reason leading to alloy failure. This work observed and analyzed the morphological characteristics, crystal structure and distribution morphology of the cell precipitates produced in the alloy, and the main factors that influence the cell-like precipitation reaction. As a result, it is considered that high oxygen content is an inducing factor for cell-like precipitation of the alloy.